2026.6.1

import java.util.Scanner;

public class a1 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
while (true){
System.out.println("微头条主菜单 ");
System.out.println("1,注册");
System.out.println("2,登录");
System.out.println("3,退出");
System.out.print("请选择：");
int choice=scanner.nextInt();
scanner.nextLine();

switch(choice){
case 1:
System.out.print("用户名：");
String regName = scanner.nextLine();
System.out.print("密码，");
String regPwd = scanner.nextLine();
System.out.println("注册成功!");
case 2:
System.out.print("用户名：");
String loginName = scanner.nextLine();
System.out.print("密码：");

String loginPwd = scanner.nextLine();

if ("admin".equals(loginName) && "123".equals(loginPwd)){
System.out.println("登录成功!");
}else {
System.out.println("用户名或密码错误!");
}
break;
case 3:
System.out.print("再见!");
scanner.close();
return;
default:
System.out.println("无效选择：请重新输入！");
}
}
}
}
import java.util.Scanner;

public class a1 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
while (true){
System.out.println("微头条主菜单 ");
System.out.println("1,注册");
System.out.println("2,登录");
System.out.println("3,退出");
System.out.print("请选择：");
int choice=scanner.nextInt();
scanner.nextLine();

switch(choice){
case 1:
System.out.print("用户名：");